Different result in built game and play mode.

• I create a camera, a rendertexture and a material in my code. I set camera's target texture to the rendertexture, set material's main texture to the rendertexture, and attach the material to my cube.
  In play mode, I get the correct result - a cube with the camera view. But in built game, the camera is null, and the cube is in default sprite.
  Enviorment : Universal RP, Cinemachine
  In Awake() method:

          GameObject cameraObject = new GameObject();
           _camera = cameraObject.AddComponent<Camera>();
           _camera.orthographic = true;
           _camera.targetTexture = _renderTexture;
           _cameraBrain = _camera.gameObject.AddComponent<CinemachineBrain>();
           _camera.orthographicSize = _defaultOrthographicSize;
           GameObject vitualCameraObject = new GameObject();
           vitualCameraObject.transform.parent = transform;
           _vitualCamera = vitualCameraObject.AddComponent<CinemachineVirtualCamera>();
           CinemachineConfiner confiner = vitualCameraObject.AddComponent<CinemachineConfiner>();
           confiner.m_BoundingShape2D = transform.Find("Confine Box").GetComponent<PolygonCollider2D>();
           _vitualCamera.AddExtension(confiner);
           _vitualCamera.m_Lens.OrthographicSize = _defaultOrthographicSize;`  
  
  

Play mode in editor:

Built game:
To debug, I change the UI ammo amount to camera's name. But in built game, the camera is null, the changing code isn't be run successful.
I have a Main Camera to render the cubes.